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Learjet 31A
Pilots Manual
CUR UM LIGHT
The red CUR LIM annunciator light, on the glareshield annunciator
panel, is installed to indicate the continuity of the 275-amp current
limiters. The 275-amp current limiters connect the battery charging
bus to the generator buses. Failure of both 275-amp current fin-titers
will cause the equipment connected to the battery charging bus to be
powered from the ship's batteries only. The light is illuminated by
sensors wired across the current limiter terminals. A failure of either
current limiter will cause the respective sensor to illuminate theCUR
LIMlight.
DC CIRCUIT BREAKERS
The aircraft DC electrical circuits are protected by push-to-reset, thermal-
type circuit breakers. Most AC and DC circuit breakers are located
on the pilot's and copilot's circuit breaker panels. Several circuit
breakers, which service interior items (READING LTS, TOILET, GALLEY,
STEREO), are installed in an overhead panel between the two
crew members. TheL and RDC BUS 1, DC BUS2, and DC BUS 3 buses
may be interconnected through the DC BUS 1 TIE, DC BUS 2 TIE,
and DC BUS 3 TIE circuit breaker/switches on the copilot's circuit
breaker panel. Normally the L and R DC buses are not tied together.
If it is desired to tie a L DC BUS and R DC BUS together, the appropriate
DC BUS TIE circuit breaker/switch must be in the up (closed)
position The DC BUS 1 circuit breaker on each circuit breaker panel
controls power to the associated DC BUS 1 bus through control relays.
Circuit breakers are grouped together into system types (e.g.
ELECTRICAL, LIGHTS, AVIONICS). Power to operate the emergency
bus system is supplied from the batteries through the respective
EMER BUS CONT circuit breaker (see figure 44).
BATTERY OVERHEAT WARNING SYSTEM
On aircraft equipped with nickel-cadmium batteries, a battery overheat
warning system is installed to warn the operator of an impending
battery overheat condition. The system consists of two thermoswitches
installed in each battery, a temperature sensor in each
battery, two overheat warning lights, a temperature indicator, and associated
aircraft wiring .
Pilot's Manual
Learjet 31A
BAT 140AND BAT 160 LIGHTS
The red BAT 140 and BAT 160 warning lights on the glareshield annunciator
panel are installed to warn the pilot that a battery is overheating.
The lights are operated by thermoswitches installed in the battery links.
The BAT 140 light will illuminate in the event either battery reaches a
temperature of 140°F (60°C) . The BAT 160 light will illuminate in the
event either battery reaches a temperature of 160°F (71°C). Since both
BAT 140 thermoswitches and both BAT 160 thermoswitches are wired
together, the pilot must refer to the BAT TEMP indicator to determine
the malfunctioning battery.
BAT TEMP INDICATOR
The BAT TEMP indicator is a dual-reading, vertical-scale instrument
and is usually located in the copilot's instrument panel. The indicator
face consists of a center scale marked from 50°F to 200°F in 25°F increments
and two pointers on opposite margins of the scale. The pointer
indicating left (#1) battery temperature is on the left margin and the
pointer indicating right (#2) battery temperature is on the right margin.
Each pointer is operated by a temperature sensor installed in the corresponding
battery cell links. Electrical power to the indicator is 28 VDC
supplied through the 1-amp BAT TEMP circuit breaker on the pilot's
circuit breaker panel.
EXTERNAL POWER RECEPTACLE
External power may be connected to the aircraft DC electrical distribution
system through a standard receptacle located on the left fuselage
adjacent to the tailcone access door. To start an engine or operate aircraft
systems using external power at least one BATTERY switch must
be in the On position; however, the generators will not come on-line
with a GPU connected. External power overvoltage protection circuits
will open the external power relay and disconnect external power from
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